Internet Protocol (IP) datagrams may arrive in a seemingly random order of chunks that the receiving IP entity must continuously collect until it can reconstruct the original datagram. Consider that the receiving IP entity possesses a buffer for assembling the original datagrams data field. The buffer will comprise of chunks of data and holes between them corresponding to data not yet received.

1. Describe an algorithm in pseudocode, prose, graphical, or any other representation, to collect and reconstruct the original datagrams data field based on this concept.
2. Describe a simple mechanism for the tracking, management, and manipulation of the holes between data chunks.